Box liner



J. M. SMITH Oct. 15, 1935.

BOX LINER Filed Jan. 2, 1954 amen m JAMES M. SMITH Patented Oct. 15, 1935 PATENT FFIE.

BOX LINER James Monroe Smith, Shelbyville, Ind., assignor to The Kennedy Car Liner & Bag 00., Shelbyville, Ind., a corporation of Indiana Application January 2, 1934, Serial No. 705,006

1 Claim.

The invention forming the subject matter of this application is a paper liner adapted to be formed into the shape of the interior of a packing box or the like, for the purpose of ensuring a proper sealing of material adapted to be packed in the box.

The main object of the invention is to provide a liner of the character described which can be formed from a blank materially less in area than liners heretofore used for the same purpose.

Another object of the invention is to provide a liner of the character described which can be readily assembled for quick installation in packing boxes and the like.

Another object of the invention is to provide a liner of this type having triangular portions adapted toextend above the top of the packing box during the filling of the same, and to be folded over the contents of the box to form a complete seal for such-contents.

A further object of the invention is to provide a box liner in which the parts extending above the top edges of the box can be folded back during the packing operation to permit more convenient filling of the lined box.

Other objects of the invention will become apparent as the detailed description thereof proceeds.

In the drawing:

Figure 1 is a plan of a blank from which the liner is constructed;

Figure 2 is a perspective View of a liner having the parts thereof folded up and assembled in the relative positions required for proper lining of the box;

Figure 3 is a perspective view of a box having a. liner arranged therein in position to seal the contents of the box, part of the box being broken away to show the assembled and sealed liner;

and

Figure 4 is a plan view of the box liner with the parts arranged as shown in Figure 2 of the drawing.

The liner, as shown in the drawing, is adapted 45 to be cut from a continuous roll of paper, with practically no waste involved in the folding and assembling thereof into finished form. The liner as shown in Figure 1 is designed for use in a square packing box. The blank I from which it 50 is formed, is, therefore, square when developed, as shown in Figure 1. The dimensions of the blank depend upon the area of the bottom of the box and the depth of the sides thereof. For example, the bottom of the liner between the 55 creases 2 and 3, is equal to the distance between the one pair of opposite sides of the box. Similarly, the distance between the creases 4 and 5 of the liner is equal to the distance between the other pair of opposite sides of the box.

The creases 2 and 3 are drawn parallel to the 5 diagonal 6 of the blank; and the creases 4 and 5 are drawn parallel to the diagonal 1 of the same blank. These pairs of creases are symmetrically arranged on the opposite side of the said diagonals 6 and l; and are continued in opposite 10 direction from the diagonals through a distance at equal to the depth of the box into which the liner is to be inserted. The outer edges of the blank extend at an angle of 45 to the diagonals 5 and l and pass through the prolongations of 15 the creases 2, 3, 4, and 5 at the distance a from each of said creases.

To provide for a folding of the liner into finished form, the parts of creases 2 and 3 extending in opposite direction from the creases 4 and 20 5 are cut to provide slits 8, 9, I0, and H. In the assembling of the liner into finished form, the blank is folded up about the creases 2 and 3 to form the rectangular sides I2 and 13, having triangular portions M and lfiextending upwardly 25 therefrom. The blank is likewise folded about the creases l and 5 to form the rectangular sides It and I! having the triangular portions I8 and I9 extending from their upper edges. The triangular flaps 2B and 2| are folded against the 30 sides !6 and H and are pasted thereto. Similarly, the triangular fiaps 22 and 23 are folded against the sides l6 and i1 and are pasted thereto. In this condition, the liner assumes the position illustrated in Figures 2 and 4 of the drawing. 35

It is obvious from inspection of Figures 2 and 3 that the liner, when assembled, will maintain its sides and the triangular flaps extending therefrom in substantially vertical positions; so that the liner may be readily inserted into a box. After the lined box is filled with material, the triangular flaps I4, l5, l8, and I9, may be folded over the top of the material to seal the same completely.

The completed liner assembled in a packed box is shown in Figure 3 of the drawing. In this figure the box is shown as comprising a bottom 24, sides 25 and 25 and a top 21. The relative position of the several parts of the liner are clearly indicated in Figure 3, as will be apparent from the reference numerals applied to said parts in the said Figure 3.

While I have described the liner as adapted for use with a box which is square in horizontal cross section, it must be understood that the invention is not limited to such use, since the blank may be laid out in substantially the same manner to adapt it for use in boxes of difierent dimensions in directions at right angles to each other.

What I claim is:

A box liner comprising a rectangular sheet of material folded to form a rectangular lining for the bottom and sides of a box, triangular flaps extending above the top edges of said sides, said top edges forming the bases of said triangles said flaps being adapted when folded inwardly to cover the same area as the bottom or top of the box, said sheet being cut to provide triangular flaps on the opposite ends of one pair of opposite sides adapted to be folded against and secured to the opposite ends of the outer faces of the other pair of sides to form an assembled liner for said box. 

